Mom And Grandma

I had to comfort mom after dad passed away. She didn’t dare or didn’t want to sleep alone. Mom was 50 then and I was 16. She clung to me at night and yes, you can imagine, it gave me a rock hard cock and I fucked her hard.
Mom wasn’t happy and cursed me, but she wanted to keep me in her bed. The next night I was riding her hard again and then mom said that it had happened now and it didn’t matter whether I fucked her once or more.
Mom started to like it and taught me to spoil her pussy with my tongue. All was well and mom joined in more and more enthusiastically.

After a two years grandma came to live with us because grandpa had passed away and had left a big debt, grandma had to sell her house and had nothing left.
Now comes the thing, I had already noticed that grandma was peeping at mom and me through a crack in the door when I fucked mom. Grandma told me last week that I have to fuck her too, otherwise she’s going to report mom and me to the police.

Yesterday I was alone with grandma and she asked if I had thought about it, and threatened again. We were home alone because mom was working and then I fucked grandma. It was quite a job because grandma is twice as fat as mom and mom is not the slimmest either. But it was nice to fuck grandma.
So I’m very busy, fucking mom in the evening and at night, and when I come home from school grandma is also waiting for me in her bedroom and expects me to fuck her at least twice after I lick her pussy.